Mechanical movement.



I. DIEHL.

MECHANICAL MOVEMENT. .APPLIOATION FILED FBB.8, 1911.

1 47,003, Patented Dec. 10, 1912.

WITNESSES. llVI/E/VTUR w. PM By COLUMBIA PLANOGRAPH C0.," VASHINGTON, D.c.

. UNITED STATES PATENT OFFICE. v

PHILIP DIEI-IL, 0F ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGERMANUFAC- TURING COMPANY, A CORPORATION OF NEW JERSEY.

MECHANICAL MOVEMENT.

Specification of Letters Patent.

Application filed February 8, 1911.

To all whom it may concern:

Be it known that I, PHILIP DIEHL, a citi- Zen of the United States,residing at Elizaboth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in MechanicalMovements, of which the following is a specification, reference beinghad therein to the accompanying drawings.

This invention relates to an improvement in motion-transmitting devicesfor commumotion from one shaft to another, and is designed moreparticularly for use in fast running machines, such as high-speed sewingmachines.

The invention has for its object to provide a simple and durabletransmitting connection between the driving and driven shafts, and onein which the weight of the parts subjected to bodily reciprocatorymovement shall be reduced to a minimum so as to produce the leastpossible vibration of the structure in which it is incorporated whenoperated at high speeds.

In its preferred embodiment the improveing and driven shafts eachprovided with a crank, a fixed fulcrum intermediate said shafts uponwhich are mounted two rocklevers sustained against endwise movementthereon, one of said rock-levers having pivotally mounted thereon atopposite ends elbowlinks each having one arm connected respectively withthe cranks of the driving and driven shafts and the other arm connectedby means of a link or other loose joint with the end of the otherrock-lever. The connection between one elbow-link and the crank of thedriving shaft imparts to the same bodily reciprocating and rockingmovements upon its fulcrum-pin upon the firstmentioned rock-lever whichmovements are transmitted through the two rock-levers to the otherelbow-link which communicates to the driven-shaft crank its rotarymovements. By suitable variations in the proportions and arrangements ofthe parts the rotary motion imparted to the driven shaft from thedriving shaft may be made variable in speed so as to producesuccessively accelerated and retarded movements in each rotation.

' In the accompanying drawings, Figure 1 is a side elevation and Fig. 2an edge view with an aperture 18.

of motion-transmitting mechanism embodylng the present improvement, andFig. 3 is a plan of the same in transverse section through the linkconnection of the driven elbow-link with its controlling rock-lever.Fig. 4 is a perspective view of the driving elbow-link. Fig. 5 is asectional elevation :of the driven shaft with its slotted crankjarm andactuating roller-stud so disposed 5 as to derive from the latter avariable rotatlng movement.

nicating either uniform or variable rotary I;

The driving shaft 1 is shown in the drawings provided with an integralcrank 2,

and the driven shaft 3 has secured upon one fextremity the hub 4 of thecrank-arm 5 formed with the radial slot 6 shown in Fig. 1.5 as extendinginwardly nearly to the axis 01f frotation beyond the extremity of the.sia t.

Intermediate the shafts 1 and 3 is mounted within the stationary bearingbosses 7 of the frame 8 the short shaft 9 constituting a stationaryfulcrum upon 1 which are independently mounted the hubs 10 and 11 of theactuating and controlling rock-levers 12 and 13, respectively, thelatter I being somewhat shorter than the former.

ment comprises, in conjunction with the drivj Embracing the crank 2 ofthe driving shaft is the strap 14 at one end of the lateral arm 15 ofthe driving elbow-link pivotally I mounted by means of the stud-screw 16upon the upper end of the actuating rock-lever l2 and having a dependingarm 17 formed The aperture 18 of the elbow-link is entered by a pivotalpin 19 carried by the short link 20 which is provided with an oppositelyextending pin 21 which enters an aperture in the upper end of thecontrolling rock-lever 13. As will be evident by reference to the fulland dotted line representations in Fig. 1, the rotation of the drivingshaft imparts to the rocklevers l2 and 13 differential vibratory movements, the actuating rock-lever receiving its movements directly fromthe crank 2 through the arm 15 of the elbow-link and the controllinglever 13 deriving its movements through the link 20 from the rocking andbodily reciprocating movements of the depending arm 17 of theelbow-link.

Entering the fork 6 of the driven-shaft crank-arm 5 is a roller-stud 22carried by the lateral arm 23 of the driven elbow-link which ispivotally mounted by means of the stud-screw24t upon the lower extremityof the actuating rock-lever 12 and is provided with an upwardlyextending arm 25 formed with anaperture entered by the pin 26 extendingfrom one face of the short link 27 from whose opposite face extends thepin 28 entering an aperture in the lower extremity of the controllingrock-lever 13.

As the dimensions of the elbow-links and the upper and lower arms of theactuating and controlling rock-levers are equal in the embodimentillustrated in Figs. 1 to 4: in

clusive, it will be observed that the circle of travel a of the centerof the crank 2 will be reproduced in a circle of travel 6 of theroller-stud 22; and if the driven shaft 3 be disposed concentricallywith the path of travel 2) of the roller-stud 22, the speed of rotationof the driven shaft will be the same at all points as that of thedriving shaft. By so disposing the parts, however, that the driven shaft3 is in eccentric relation to the circular path of travel I) of therollerstud 22, as represented in Fig. 5, it will be observed that themovement of the rollerstud 22 through one-half of its circumference oftravel will cause it to traverse an are less than a semi-circumferencearound the .driven shaft 3, while the completion of the rotation of theroller-stud will cause it to pass through an are around the driven shaftgreater than a semi-circumference, thus producing an alternatelyretarded and accelerated rotary movement of the driven shaft for eachuniform rotation of the driving shaft. It is obvious that by changingthe proportions of the component parts of the transmitting mechanism theactuating roller-stud 22 may be'caused to traverse elliptical paths,which will produce other modes of variation in the rotation of thedriven shaft from that above described. Thus, by inversely changing thelengths of the rocker-arm 26 and the lower arm of the controllingrock-lever 13 so as to bring the pivotal pins 26 and 28 nearer thefulcrum 9, the lower elbow link will receive a shorter rocking movementon its stud-screw 24: carried by the rock-lever 12, and the path ofmovement Z) of the roller-stud 22 will become an ellipse with its majoraxis substantially horizontal. A shortening of the rocker-arm 25 andcorresponding lengthening of the rock-lever arm 13 will cause anincreased oscillatory movement of the member 23 upon its stud-screw 24and change thecircle of travel 7) into an ellipse with its major axissubstantially vertical. From the foregoing description, it will be seenthat the present improvement is not limited to the specific embodimentherein shown and described, but is susceptible of very materialmodification within the scope of the. present invention.

Having thus set forth the nature of the invention, what I claim hereinis 1. In combination, a driving shaft, 2.

driven shaft, a crank fixed upon each shaft, a rock-lever havingindependent operative connections with said cranks, a fixed fulcrum uponwhich said rock-lever is sustained against endwise movement, andpositively acting means directly connected with and actuated by saidrock-lever for controlling the direction of rotation imparted to thedriven shaft by said rock-lever relatively to that of the driving shaft.

2. In combination, a driving shaft, a driven shaft, a crank fixed uponeach shaft, a rock-lever, a fulcrum therefor, links each connected atone end independently of the other with said rock-lever and at theopposite end respectively with the cranks of said driving and drivenshafts, and a connection between said links at points thereof offsetfrom the line of connection of the same with said rock-lever and theirrespective shafts for controlling the direction of rotation of thedriven shaft relatively to that of the driving shaft.

3. In combination, a driving shaft, a driven shaft, a fixed fulcrum, anactuating rock-lever mounted upon said fulcrum, an operative connectionbetween the driving shaft and said rock-lever whereby the latter isvibrated, an operative connection between the rock-lever and the drivenshaft through which the latter derives rotary movements, a controllingrock-lever also mounted on said fixed fulcrum, means acting through theconnection of the actuating rock-lever with the driving shaft forimparting to the controlling rock-lever differential vibratory movementsrelative to those of the actuating rock-lever, and means connected withthe controlling rock-lever for determining the direction of action ofthe connection between the actuating rock-lever and the driven shaft.

4:. In combination, a driving shaft, a driven shaft, a crank carried byeach shaft, a pair of rock-levers each mounted upon a stationary fulcrumin fixed relation to its ends, and elbow-links each fulcrumed upon oneof said rock-levers and having one arm connected with the other of saidrock-levers and the other arm connected with a crank =upon the drivingand driven shafts, re-

spectively.

5. I11 combination, a driving shaft, a driven shaft, a crank carried bythe driving shaft, a stationary fulcrum, actuating and controllingrock-levers mounted for independent movement upon said fulcrum, anoperative connection between the actuating rock-lever and the crank ofthe driving shaft, a connection between said rock-levers whereby thecontrolling rock-lever is vibrated relatively to the actuatingrock-lever, a rocker carried by the actuating rock-lever, a pin carriedby said rocker and movable in a path alternately approaching andreceding from the axis of the driven shaft, an operaname to thisspecification, in the presence of tive connetion between said pin andthe two subscribing witnesses. driven sha t, and a connection etween thecontrolling rock-lever and said rocker where- PHILIP DIEHL' 5 by saidpin mounted upon the latter is given WVitnesses:

its described path of movement. A. KoRNnMANN, J12,

In testimony whereof, I have signed my W. P. STEWART.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

